Personalized Coolest Chemical Engineer Toddler T-Shirt. A hard hat topped snowman, holding a beaker and The world's coolest chemical engineer text is a funny design for birthdays and holidays. A toddler-soft cotton tee in look-at-me, big kid colors. 4.5 oz., 100% combed ringspun cotton. White is sewn with 100% cotton thread. Topstitched rib crew neck. Double-needle stitched sleeves and bottom hem. Shoulder-to-shoulder taping.